期刊
PHYSICAL REVIEW C
卷 103, 期 2, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevC.103.L021901
关键词
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资金
- U.S. Department of Energy (DOE) Office of Nuclear Physics [DE-SC0019128]
- U.S. Department of Energy (DOE) Office of High Energy Physics [DE-SC0012567]
- Tushar Shah and Sara Zion Fellowship
- U.S. Department of Energy (DOE) [DE-SC0019128] Funding Source: U.S. Department of Energy (DOE)
This study demonstrates a data-driven method for separating quark and gluon contributions to jet observables using topic modeling, showing potential for experimental determination of quark- and gluon-jet modifications in heavy-ion collisions.
Whether quark- and gluon-initiated jets are modified differently by the quark-gluon plasma produced in heavy-ion collisions is a long-standing question that has thus far eluded a definitive experimental answer. A crucial complication for quark-gluon discrimination in both proton-proton and heavy-ion collisions is that all measurements necessarily average over the (unknown) quark-gluon composition of a jet sample. In the heavy-ion context, the simultaneous modification of both the fractions and substructure of quark and gluon jets by the quark-gluon plasma further obscures the interpretation. Here, we demonstrate a fully data-driven method for separating quark and gluon contributions to jet observables using a statistical technique called topic modeling. Assuming that jet distributions are a mixture of underlying quark-like and gluon-like distributions, we show how to extract quark- and gluon-jet fractions and constituent multiplicity distributions as a function of the jet transverse momentum. This proof-of-concept study is based on proton-proton and heavy-ion collision events from the Monte Carlo event generator JEWEL with statistics accessible in Run 4 of the Large Hadron Collider. These results suggest the potential for an experimental determination of quark- and gluon-jet modifications.
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